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From retina to response: contrast sensitivity and memory retrieval during visual word recognition
1Center for the Study of Aging and Human Development, Duke University Medical Center, Durham, North Carolina 27710.
Experimental Aging Research
|January 1, 1987
Summary
Older adults showed slower word recognition speed than young adults. However, age did not specifically impact orthographic or semantic information retrieval, and contrast sensitivity differences did not explain the slowing.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Human Aging Research
Background:
- Cognitive aging research often examines age-related differences in information processing speed.
- Lexical decision tasks are common for assessing word recognition and underlying cognitive processes.
Purpose of the Study:
- To investigate age-related differences in the speed of orthographic and semantic information retrieval during word recognition.
- To determine if age-related slowing in lexical decision is linked to visual processing, specifically contrast sensitivity.
Main Methods:
- Young and older adults performed a lexical decision task (word/nonword classification).
- Orthographic and semantic retrieval times were estimated.
- Contrast sensitivity was measured as an indicator of visual spatial resolution.
Main Results:
- Older adults were slower in overall word recognition compared to young adults.
- No significant age-related slowing was found specifically in orthographic or semantic information retrieval.
- Age-related changes in contrast sensitivity function were observed, but did not account for word recognition speed differences.
Conclusions:
- Slower word recognition in older adults is not attributable to specific deficits in accessing orthographic or semantic knowledge.
- Visual factors like contrast sensitivity do not fully explain age-related slowing in lexical decision tasks.